Help with Japenese acan receding

[currentking]

anyone know if the Japenese acan is much more picky or harder to keep than Aussie and indo acans? I have several Acans which are doing great and having babies but the Japenese acan colony is receding on 2 sides. All acan colonies are under gen 2 pro radions that peak at 45% and are on the sand bed. No nitrates or phosphates. Mag, calcium and Alk are in line. I have tons of favia's that are doing great and sps that the polyps are fully extended and growing.

 

[zesty]

any pictures?

 

[zoous]

Do you have any peppermint shrimps in your tank?

 

[Usctom]

What color is the skeleton. If anything other then white or brownish could be bacterial. I'v had issues in the past were the skeleton were pink/red. The only thing that helped was an iodine dip.

 

[-Logzor]

Possible it is begin stung by favia sweepers a night? Will it take food?

Perhaps try and H2O2 dip or Iodine dip.

 

[currentking]

sorry guys, i will get pictures up tomorrow. There are no other coral around besides acan colonies on the sand. The skeleton is white. I have several reef safe wrasse, hermit crabs and emerald crabs. No shrimp in the tank. It will still take food and the polyps still get nice and big.